Therm-o-disc, Incorporated

Douglas E Prather

Prasad S Khadkikar

Jeffrey A West

Richard E Welch

Derek J Rose

Richard L Gerich

Christine M Hudson

Douglas J Kempf

An improved flue pipe construction particularly adapted for a fuel fired water heater is disclosed which serves to reduce or minimize heat loss when the water heater is in a standby mode. The flue pipe construction comprises inner and outer concentric flue pipes which define an air space therebetween and one or more valve arrangements associated therewith to selectively restrict air flow through such air space. The valve arrangements include a thermally responsive actuator operative to open and close the valve member in response to heat generated by firing of the burner assembly without the need for any external power supply or interlocks.

Flue pipe control

Growing community of inventors

Jackson, MI, United States of America

Douglas E Prather